Answer : (1) The number of molecules will be, \(42.154\times 10^{23}\)
(2) The number of moles of chlorine atoms is, 6.0112 moles
Solution :
(1) As, 1 mole \(H_2S\) contains \(6.022\times 10^{23}\) number of molecules
So, 7 moles \(H_2S\) contains \(7\times 6.022\times 10^{23}=42.154\times 10^{23}\) number of molecules
Therefore, the number of molecules will be, \(42.154\times 10^{23}\)
(2) Number of atoms of magnesium chloride = \(1.81\times 10^{24}\)
In one magnesium chloride molecule there are two chlorine atoms.
Number of chlorine atoms in \(1.81\times 10^{24}\) atoms of magnesium chloride = \(2\times 1.81\times 10^{24}=3.62\times 10^{24}\)
1 mole = \(6.022\times 10^{23}\) atoms
Moles of chlorine = \(\frac{3.62\times 10^{24}}{6.022\times 10^{23}}=6.0112moles\)
Therefore, the number of moles of chlorine atoms is, 6.0112 moles
